Minecraft!!!
Update, November 2014: These days, I’m hosting my own vanilla minecraft server on Linode, using MCMyAdmin for a web interface. I finally did it. I broke down and rented a Minecraft server. Previously, I had hosted a Minecraft server pretty successfully on my personal web server. The problem became two-fold: it was a huge time-sink, as updating all the plugins that I was running took a long time at each release. Also, while hosting the Minecraft server, my server would often become unresponsive, requiring a restart. This was unacceptable, as I also host a Teamspeak 3 server, an IRC bouncer, and multiple websites from my server. I needed maximum uptime! So I finally shut down my Minecraft server for good. ...